Hull City’s Ecuadorian midfielder Oscar Zambrano has been suspended until further notice by the South American football confederation Conmebol for breaching anti-doping rules.
The 20-year-old has scored one goal in eight appearances for the Tigers since joining from Ecuadorian club LDU Quito on a season-long loan in August, with the option to make the transfer permanent.
Zambrano reportedly tested positive after the second leg of the Recopa Sudamericana in March but remained eligible to play.
Hull have said he has now been suspended from all football with immediate effect for breaching doping rules “set out in Articles 6 and 7 of the Conmebol Anti-Doping Regulations”.
“Zambrano and his defence will use their right to appeal this decision to the Court of Arbitration for Sport (Cas),” the club added.
“The club is not in a position to provide further information at this time.”
Zambrano scored his first Hull goal in their 4-1 win against Cardiff in September.
The Tigers are 15th in the Championship after three wins and six draws in 13 games.